共查询到20条相似文献，搜索用时 62 毫秒
1.
依据采自青海海西德令哈、乌兰的树木年轮资料序列与柴达木东北缘1961～2001年夏季(6～8)平均气温资料序列之间较好的同期相关特征,重建了柴达木东北缘夏季(6～8)平均气温千年历史资料序列。运用乘积平均值、误差缩减值等方法对重建方程进行了检验,证明重建序列可信。通过分析发现,在重建的1098a中,有7个主要的冷期和6个主要的暖期,重建的气温序列存在15个主要突变时段。周期分析表明柴达木东北缘夏季气温存在46、52、61、73、91、183a和366a左右的长周期以及6.8a和2～3a的短周期。 相似文献
2.
使用树轮资料重建阿勒泰西部年积雪深度≥0cm日数的长期变化 总被引：1，自引：0，他引：1
利用阿勒泰西部柯姆采点的西伯利亚落叶松树轮宽度年表重建了大致反映该地区1720/1721年至2004/2005年年积雪深度≥0 cm日数变化情况的序列。自1720/1721年至1956/1957年以来,该地区年积雪日数变化存在9个偏少阶段和8个偏多阶段。积雪日数最少阶段出现在1906/1907年至1920/1921年,而积雪日数最多阶段出现在1787/1788年至1797/1798年。功率谱分析检测到该地区年积雪日数重建序列存在10.7～11 a、6.7 a和2.1 a的显著准周期及16.5～17.2 a和2.4～6.6 a的较显著准周期。滑动t检验的结果表明该地区年积雪日数重建序列没有发生明显突变。 相似文献
3.
对黑龙江省小兴安岭五营丰林国家自然保护区建立的红松 (Pinus koraiensis) 树轮宽度年表与五营气象站的气候要素响应分析表明,树轮年表与生长季上一年10月份的平均温度显著相关,由此重建了1796-2004年五营10月份平均温度。此外,4月下旬的温度变化对五营红松树木的径向生长也具有一定的影响。1796-2004年,五营共经历了4个偏冷和4个偏暖期。周期分析表明,重建序列以3.33 a的周期最为显著,对重建序列30 a尺度的突变检验结果表明,1871年和1900年前后,五营地区10月份平均温度出现了显著的均值突变,1851年前后出现了明显的方差突变。 相似文献
4.
我国过去千年地表温度序列的初步重建 总被引：8，自引：1，他引：7
通过对器测温度资料与代用温度资料的研究,对中国过去1 000年的地表温度序列进行了初步重建.重建主要以树轮年表资料为基础,采用不同方法分别合成具有年分辨率的400年与1 000年西部温度序列,以及具有10年分辨率的400年全国温度序列和具有30年分辨率的1 000年全国温度序列.全国温度重建结果表明,中国在1000～1310年间表现出了与欧洲中世纪暖期相对应的温暖阶段,但该暖期在中国西部地区反映得并不明显;而14到19世纪的小冰期则在所有序列中均有显著表现;19世纪中期至上世纪80年代升温显著,但并未超过中世纪暖期水平.作者也讨论了重建序列的不确定性,以及重建序列与前人研究结果的异同. 相似文献
5.
6.
利用1981—2016年德令哈市国家基本气象站地面温度和气温数据资料,从年、季和月3个方面研究地面温度的变化特征。结果表明:近36a德令哈市年平均地面温度、地面最高温度和地面最低温度分别以0.811℃/10a、0.063℃/10a和1.247℃/10a的气候倾向率呈上升趋势;各季平均地面温度和地面最低温度呈上升趋势,春季平均地面最高温度呈上升趋势而夏秋冬三季呈下降趋势;月平均地面温度和地面最高最低温度的变化呈单峰式特点,各月平均地面温度和地面最低温度呈上升趋势,平均地面最高温度1—6月份呈上升趋势,7—12月份呈下降趋势;年平均地面温度和地面最低温度分别在1997年和2001年出现突变,年平均地面最高温度未出现突变;年、季、月平均地面温度与平均气温呈显著的正相关。 相似文献
7.
辽西地区土地退化对局地温度影响的数值模拟 总被引：2，自引：1，他引：2
辽西地区近几十年来土地退化状况严重。许多地区已成为生态脆弱区。利用中尺度模式(MM5V3．5)。选择2001年6月份气象观测资料。根据辽西地区土地退化的有关调查材料。对模式中的下垫面状况(1anduse)进行改变。模拟在下垫面状况改变后。辽西地区和辽宁省的温度变化和感热通量、潜热通量变化。模拟结果表明：在对不同的下垫面状况进行改变后。土地退化地区的6月份的月平均气温将升高0．1～0．7℃。月平均地表温度将升高0．3～1．3℃；地面感热通量增大。潜热通量减小。对试验区内其他地区影响不大。 相似文献
8.
9.
10.
利用青海柴达木盆地东北缘山地11个地点的祁连圆柏树轮宽度序列,在早期分析祁连圆柏的生长对气候要素响应的基础上,重建了青海德令哈和乌兰地区过去1437 a的年降水量变化序列。重建方程能够解释校准期（1955-2002年）内66%的降水量变化方差,尤其是重建的降水序列的低频变化能够很好地代表器测资料的变化。从过去1437 a的时间尺度来看,近40 a来柴达木东北缘地区处于相对湿润的时期,但最显著的湿润期出现在16世纪晚期。此外,小冰期期间降水量的变幅较大,而中世纪暖期降水低频变化相对较小。另外,重建降水量体现了150～250 a尺度的低频变化特征。 相似文献
11.
The spatial and temporal variations of daily maximum temperature(Tmax), daily minimum temperature(Tmin), daily maximum precipitation(Pmax) and daily maximum wind speed(WSmax) were examined in China using Mann-Kendall test and linear regression method. The results indicated that for China as a whole, Tmax, Tmin and Pmax had significant increasing trends at rates of 0.15℃ per decade, 0.45℃ per decade and 0.58 mm per decade,respectively, while WSmax had decreased significantly at 1.18 m·s~(-1) per decade during 1959—2014. In all regions of China, Tmin increased and WSmax decreased significantly. Spatially, Tmax increased significantly at most of the stations in South China(SC), northwestern North China(NC), northeastern Northeast China(NEC), eastern Northwest China(NWC) and eastern Southwest China(SWC), and the increasing trends were significant in NC, SC, NWC and SWC on the regional average. Tmin increased significantly at most of the stations in China, with notable increase in NEC, northern and southeastern NC and northwestern and eastern NWC. Pmax showed no significant trend at most of the stations in China, and on the regional average it decreased significantly in NC but increased in SC, NWC and the mid-lower Yangtze River valley(YR). WSmax decreased significantly at the vast majority of stations in China, with remarkable decrease in northern NC, northern and central YR, central and southern SC and in parts of central NEC and western NWC. With global climate change and rapidly economic development, China has become more vulnerable to climatic extremes and meteorological disasters, so more strategies of mitigation and/or adaptation of climatic extremes,such as environmentally-friendly and low-cost energy production systems and the enhancement of engineering defense measures are necessary for government and social publics. 相似文献
12.
Yuepeng PAN Mengna GU Yuexin HE Dianming WU Chunyan LIU Linlin SONG Shili TIAN Xuemei Lü Yang SUN Tao SONG Wendell W. WALTERS Xuejun LIU Nicholas A. MARTIN Qianqian ZHANG Yunting FANG Valerio FERRACCI Yuesi WANG 《大气科学进展》2020,37(9):933-938
正While China’s Air Pollution Prevention and Control Action Plan on particulate matter since 2013 has reduced sulfate significantly, aerosol ammonium nitrate remains high in East China. As the high nitrate abundances are strongly linked with ammonia, reducing ammonia emissions is becoming increasingly important to improve the air quality of China. Although satellite data provide evidence of substantial increases in atmospheric ammonia concentrations over major agricultural regions, long-term surface observation of ammonia concentrations are sparse. In addition, there is still no consensus on 相似文献
13.
《大气和海洋科学快报》2013,(4):227
正AIMS AND SCOPE Atmospheric and Oceanic Science Letters (AOSL) publishes short research letters on all disciplines of the atmosphere sciences and physical oceanography. 相似文献
14.
Connections between the Eurasian teleconnection and concurrent variation of upper-level jets over East Asia 总被引：3，自引：0，他引：3
The variation of the East Asian jet stream(EAJS) associated with the Eurasian(EU) teleconnection pattern is investigated using 60-yr NCEP–NCAR daily reanalysis data over the period 1951–2010. The EAJS consists of three components: the polar front jet(PFJ); the plateau subtropical jet(PSJ); and the ocean subtropical jet(OSJ). Of these three jets over East Asia,the EU pattern exhibits a significant influence on the PFJ and OSJ. There is a simultaneous negative correlation between the EU pattern and the PFJ. A significant positive correlation is found between the EU pattern and the OSJ when the EU pattern leads the OSJ by about 5 days. There is no obvious correlation between the EU pattern and the PSJ. The positive EU phase is accompanied by a weakened and poleward-shifted PFJ, which coincides with an intensified OSJ. A possible mechanism for the variation of the EAJS during different EU phases is explored via analyzing the effects of 10-day high-and low-frequency eddy forcing. The zonal wind tendency due to high-frequency eddy forcing contributes to the simultaneous negative correlation between the EU pattern and the PFJ, as well as the northward/southward shift of the PFJ. High- and low-frequency eddy forcing are both responsible for the positive correlation between the EU pattern and the OSJ, but only high-frequency eddy forcing contributes to the lagged variation of the OSJ relative to the EU pattern. The negative correlation between the EU pattern and winter temperature and precipitation anomalies in China is maintained only when the PFJ and OSJ are out of phase with each other. Thus, the EAJS plays an important role in transmitting the EU signal to winter temperature and precipitation anomalies in China. 相似文献
15.
<p>PARTITION OF SEASON BASED ON MULTIELEMENTS AND THE DECADAL CHANGE OF SEASON DURATION IN CHINA</p>
<p>Using the multielements similarity measurement method and 1950–C2017 NCEP/NCAR gridded daily reanalysis datasets, we analyzed season duration in China during 1950–C2016, and we defined the element with maximum absolute sensitivity as the key impact element at each point using the sensitivity analysis method. The decadal change of season duration and its key impact element before and after 1980 were studied. The results indicated obvious meridional and zonal differences in the distribution of season duration for the 67-year average, and that the key impact element has the same distribution characteristics as season duration. In addition, complementary relationships were found between the durations of spring and summer, autumn and winter, and the cold and warm seasons. Of those, the complementary relationship between the durations of spring and summer was strongest and the regions of complementarity were numerous. The complementary regions of autumn and winter durations were found mainly in western China. In the cold and warm seasons, the complementary regions were widespread and the complementary relationship was generally weak. Comparison of the periods before and after 1980 revealed an east–Cwest difference in the interdecadal variation of season duration. Interdecadal variation in spring and summer was found concentrated in northern and western regions, while that in autumn and winter was concentrated in the western region. Areas of significant interdecadal variation of the key elements were found concentrated in northern and western regions, corresponding well with the areas of significant interdecadal variation of season duration.</p> 相似文献
16.
By using the gauged rainfall in 160 stations within mainland China and the NCEP/NCAR reanalysis data, the impacts of anomalous SST in Kuroshio and its extension on precipitation in Northeast China were investigated. The results show that a difference in the meridional circulation such as the East Asia/Pacific teleconnection pattern(EAP)may be responsible for the difference in rainfall between 1998 and 2010. In comparison with 1998, the anomalous meridional circulation pattern in 2010 shifted northeastward, and then the western subtropical high, the mid-latitudinal trough and the northeastern Asia blocking high also shifted northeastward, causing intensified convergence of the cold and warm air masses at the southern region and thus more rainfall in the southwestern region and less in the northwestern region. In 1998, the anomalous cyclone, one component of the meridional pattern, located at the Songhuajiang-Nengjiang River basin, resulted in more rainfall in the majority of the area. The results of observation and the model show that the difference in SSTA in Kuroshio and its extension under the background of different El Ni觡o events is the key point:(1) The anomalous warmth moved westward from the mid-Pacific to the east of the Philippine Sea during the central event, which led the heat resources shifting to the northeast in 2010; subsequently, a shift occurred to the north of the anomalous ascent and decent, followed by a warm SSTA in the region of Kuroshio's extension in 2010 and Kuroshio in 1998.(2) The warm SSTA in the Kuroshio extension causing the Rossby wave activity flux strengthened in 2010, and then the westerly jet shifted northward and extended eastward. A warm SSTA in Kuroshio and cold SSTA in its extension in 1998 caused the westerly jet to shift southward and weaken. As a result,the anomalous anticyclone and cyclone shifted northward in 2010, and the blocking high also shifted northward. 相似文献
17.
Understanding potential future influence of environmental, economic, and social drivers on land-use and sustainability is critical for guiding strategic decisions that can help nations adapt to change, anticipate opportunities, and cope with surprises. Using the Land-Use Trade-Offs (LUTO) model, we undertook a comprehensive, detailed, integrated, and quantitative scenario analysis of land-use and sustainability for Australia’s agricultural land from 2013–2050, under interacting global change and domestic policies, and considering key uncertainties. We assessed land use competition between multiple land-uses and assessed the sustainability of economic returns and ecosystem services at high spatial (1.1 km grid cells) and temporal (annual) resolution. We found substantial potential for land-use transition from agriculture to carbon plantings, environmental plantings, and biofuels cropping under certain scenarios, with impacts on the sustainability of economic returns and ecosystem services including food/fibre production, emissions abatement, water resource use, biodiversity services, and energy production. However, the type, magnitude, timing, and location of land-use responses and their impacts were highly dependent on scenario parameter assumptions including global outlook and emissions abatement effort, domestic land-use policy settings, land-use change adoption behaviour, productivity growth, and capacity constraints. With strong global abatement incentives complemented by biodiversity-focussed domestic land-use policy, land-use responses can substantially increase and diversify economic returns to land and produce a much wider range of ecosystem services such as emissions abatement, biodiversity, and energy, without major impacts on agricultural production. However, better governance is needed for managing potentially significant water resource impacts. The results have wide-ranging implications for land-use and sustainability policy and governance at global and domestic scales and can inform strategic thinking and decision-making about land-use and sustainability in Australia. A comprehensive and freely available 26 GB data pack (http://doi.org/10.4225/08/5604A2E8A00CC) provides a unique resource for further research. As similarly nuanced transformational change is also possible elsewhere, our template for comprehensive, integrated, quantitative, and high resolution scenario analysis can support other nations in strategic thinking and decision-making to prepare for an uncertain future. 相似文献
18.
Fei LIU Chen XING Jinbao LI Bin WANG Jing CHAI Chaochao GAO Gang HUANG Jian LIU Deliang CHEN 《大气科学进展》2020,37(7):663-670
正The Taal Volcano in Luzon is one of the most active and dangerous volcanoes of the Philippines. A recent eruption occurred on 12 January 2020(Fig. 1a), and this volcano is still active with the occurrence of volcanic earthquakes. The eruption has become a deep concern worldwide, not only for its damage on local society, but also for potential hazardous consequences on the Earth's climate and environment. 相似文献
19.
20.
Characterization and source apportionment of volatile organic compounds in urban and suburban Tianjin,China 总被引：1，自引：0，他引：1
Tianjin is the third largest megacity and the fastest growth area in China, and consequently faces the problems of surface ozone and haze episodes. This study measures and characterizes volatile organic compounds(VOCs), which are ozone precursors, to identify their possible sources and evaluate their contribution to ozone formation in urban and suburban Tianjin,China during the Ha Chi(Haze in China) summer campaign in 2009. A total of 107 species of ambient VOCs were detected,and the average concentrations of VOCs at urban and suburban sites were 92 and 174 ppbv, respectively. Of those, 51 species of VOCs were extracted to analyze the possible VOC sources using positive matrix factorization. The identified sources of VOCs were significantly related to vehicular activities, which specifically contributed 60% to urban and 42% to suburban VOCs loadings in Tianjin. Industrial emission was the second most prominent source of ambient VOCs in both urban and suburban areas, although the contribution of industry in the suburban area(36%) was much higher than that at the urban area(16%). We conclude that controlling vehicle emissions should be a top priority for VOC reduction, and that fast industrialization and urbanization causes air pollution to be more complex due to the combined emission of VOCs from industry and daily life, especially in suburban areas. 相似文献